I would like feedback on this riddle I made up. I would classify it with a moderately difficult rating, but I could be wrong.
Of tiny little planks from end to end when told are sharp and flat.
When moving: forward or not at all, and family to us all, at that!
Please let me know how easy it was to solve, and if you needed the hint(s).
HINT 1
plank = planck
HINT 2
family = relative